4 * Copyright (c) 2003,2004 The DragonFly Project. All rights reserved.
6 * This code is derived from software contributed to The DragonFly Project
7 * by Matthew Dillon <dillon@backplane.com>
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
19 * 3. Neither the name of The DragonFly Project nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific, prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
26 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
27 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
29 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
31 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
33 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * $DragonFly: src/sys/sys/systimer.h,v 1.2 2004/07/16 05:51:57 dillon Exp $
39 #ifndef _SYS_SYSTIMER_H_
40 #define _SYS_SYSTIMER_H_
44 typedef __uint32_t sysclock_t;
45 typedef TAILQ_HEAD(systimerq, systimer) *systimerq_t;
46 typedef void (*systimer_func_t)(struct systimer *info);
47 typedef void (*systimer_func2_t)(struct systimer *info, struct intrframe *frame);
49 typedef struct systimer {
50 TAILQ_ENTRY(systimer) node;
52 sysclock_t time; /* absolute time next intr */
53 sysclock_t periodic; /* if non-zero */
54 systimer_func2_t func;
57 struct globaldata *gd; /* cpu owning structure */
60 #define SYSTF_ONQUEUE 0x0001
61 #define SYSTF_IPIRUNNING 0x0002
63 void systimer_intr(sysclock_t *time, struct intrframe *frame);
64 void systimer_add(systimer_t info);
65 void systimer_del(systimer_t info);
66 void systimer_init_periodic(systimer_t info, void *func, void *data, int hz);
67 void systimer_init_oneshot(systimer_t info, void *func, void *data, int us);
71 * note that cputimer_count() always returns a full-width wrapping counter.
73 sysclock_t cputimer_count(void);
74 sysclock_t cputimer_fromhz(int freq);
75 sysclock_t cputimer_fromus(int us);
76 void cputimer_intr_reload(sysclock_t clock);
79 * These variables hold the fixed cputimer frequency, determining the
80 * granularity of cputimer_count().
82 * The 64 bit versions are used for converting count values into uS or nS
85 * usec = (cputimer_freq64_usec * count) >> 32
87 extern sysclock_t cputimer_freq; /* in Hz */
88 extern int64_t cputimer_freq64_usec; /* in (1e6 << 32) / timer_freq */
89 extern int64_t cputimer_freq64_nsec; /* in (1e9 << 32) / timer_freq */